Photochemical reactions of tricarbonyl[hydrotris(1-pyrazolyl)borato]rhenium(I) in the presence of neutral donor ligands. X-Ray crystal structures of the substitution derivatives [Re{HB(pz)3}(CO)2L], with L = C4H8O or PPh3

Abstract

The complex [Re{HB(pz),}(CO),][HB(pz), = hydrotris(1 -pyrazolyl)borate] has been prepared. Ultraviolet irradiation of its tetrahydrofuran (thf) solution gave [Re{H B(pz),}( CO),(thf)], which allowed the synthesis of a series of substitution derivatives [Re{HB(pz),}(CO),L],

Reactions of TpRe(CO)2(THF) with Aromatic Molecules (Tp = Hydridotris(pyrazolyl)borate)

“…Recently, transition metal chemistry with hydridotris(pyrazolyl)borate ligands has attracted considerable attention. , Moret et al have reported that the tetrahydrofuran (THF) ligand of TpRe(CO) 2 (THF) ( 3 ) (Tp = hydridotris(pyrazolyl)borate) is labile, and the facile dissociation of the cyclic ether ligand allowed access to complexes of the type TpRe(CO) 2 (L) (L = PPh 3 , CH 3 CN, pyridine, and PMe 2 Ph) . To establish a benchmark for spectroscopic reference, the coordination of a nonaromatic hydrocarbon was attempted first.…”

“…TpRe(CO) 3 ( 2 ) and TpRe(CO) 2 (THF) ( 3 ) have been previously reported in the literature . KTp was prepared according to a published procedure …”

“…TpRe ( CO ) 3 ( 1 ) . The following procedure is a modification of a literature preparation . In a typical reaction, Re(CO) 5 Cl (3.0524 g, 8.44 mmol) and KTp (7.448 g, 29.5 mmol, 3.5 equiv) were dissolved in THF (500 mL).…”

Intraligand fluorescence and phosphorescence of tris(pyrazolyl) hydridoborate complexes

“…While Tp complexes have been characterized by many different methods very little is known about their electronic spectra and photochemistry. A few spectral assignments [6][7][8] and photochemical observations [9][10][11][12] have been reported. However, Tp À seems to act as a spectator ligand in these cases.…”

Low-valent Organorhenium Compounds

“…372 The rhenium carbonyl halides [ReBr(CO) 5 ] " react with amino(imino)thiophosphoranes (R 3 C)(R 3 Si)NP(S)=NCR 3 or R(S)P(NCR 3 )SiR 2 NCR 3 to give (168) in 37% and 68% yield, respectively. 373 The tricyclic rhenium complex (169) (R = TMS) is formed in 35% yield from [ReBr(CO) 3 Rhenium complexes with tridentate nitrogen ligands have also been reported including the 1 , 4 , 7triazacyclononane ligand (172), 380 the hydrotris(l-pyrazolyl)borate ligand (173), 381 4 ] with NaBH 4 (44% yield). Treatment of the dinitrogen complex with HX gives the dihalides c/s-[Re(CO) 2 (X) 2 (r|-Cp*)], which are converted to the trans-isomevs, upon photolysis.…”